void VigenereForwardIterator::encodeCurrentChar$()$ noexcept $\{$

if $($fKeys $!=$ fKeys.end$())\{$

char messageChar $=$ fSource$[$fIndex$]$;

if $($std::isalpha$($messageChar$))\{$

char keywordChar $=*$fKeys;

size$\_$t row $=$ static$\_$cast$($std::toupper$($keywordChar$))-\text{'}$A$\text{'}$;

size$\_$t column $=$ static$\_$cast$($std::toupper$($messageChar$))-\text{'}$A$\text{'}$;

char encodedChar $=$ fMappingTable$[$row$][$column$]$;

if $($std::islower$($messageChar$))\{$

encodedChar $=$ std::tolower$($encodedChar$)$;

$\}$

fCurrentChar $=$ encodedChar;

$++$fKeys;

$\}$

else $\{$

fCurrentChar $=$ messageChar;

$\}$

$\}$

else $\{$

fCurrentChar $=\text{'}\backslash 0\text{'}$;

$\}$

$\}$

void VigenereForwardIterator::decodeCurrentChar$()$ noexcept $\{$

if $($fKeys $!=$ fKeys.end$())\{$

char messageChar $=$ fSource$[$fIndex$]$;

if $($std::isalpha$($messageChar$))\{$

char keywordChar $=*$fKeys;

size$\_$t row $=$ static$\_$cast$($std::toupper$($keywordChar$))-\text{'}$A$\text{'}$;

size$\_$t column $=0$;

while $($column $<$ CHARACTERS && fMappingTable$[$row$][$column$]!=$ std::toupper$($messageChar$))\{$

$++$column;

$\}$

char decodedChar $=$ static$\_$cast$(\text{'}$A$\text{'}+$ column$)$;

if $($std::islower$($messageChar$))\{$

decodedChar $=$ std::tolower$($decodedChar$)$;

$\}$

fCurrentChar $=$ decodedChar;

$++$fKeys;

$\}$

else $\{$

fCurrentChar $=$ messageChar;

$\}$

$\}$

else $\{$

fCurrentChar $=\text{'}\backslash 0\text{'}$;

$\}$

$\}$

getting these errors

Severity Code Description Project File Line Suppression State Details

Warning $\text{'}=\text{'}$: conversion from 'size$\_$t$\text{'}$ to 'char', possible loss of data C:$\backslash$Users$\backslash$abira$\backslash$Desktop$\backslash$repos$\backslash$Programs$\backslash$Midterm$\backslash$Midterm$\backslash$VigenereForwardIterator$.$cpp $27$

Severity Code Description Project File Line Suppression State Details

Warning C$6385$ Reading invalid data from 'this$->$fMappingTable'. Midterm C:$\backslash$Users$\backslash$abira$\backslash$Desktop$\backslash$repos$\backslash$Programs$\backslash$Midterm$\backslash$Midterm$\backslash$VigenereForwardIterator$.$cpp $14$

Severity Code Description Project File Line Suppression State Details

Warning C$6385$ Reading invalid data from 'this$->$fMappingTable$[$row$]\text{'}.$ Midterm C:$\backslash$Users$\backslash$abira$\backslash$Desktop$\backslash$repos$\backslash$Programs$\backslash$Midterm$\backslash$Midterm$\backslash$VigenereForwardIterator$.$cpp $14$

Severity Code Description Project File Line Suppression State Details

Warning C$6385$ Reading invalid data from 'this$->$fMappingTable'. Midterm C:$\backslash$Users$\backslash$abira$\backslash$Desktop$\backslash$repos$\backslash$Programs$\backslash$Midterm$\backslash$Midterm$\backslash$VigenereForwardIterator$.$cpp $37$

how to fix